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 * and open the template in the editor.
 */

package org.dusin.teachassist.servlet.teacher;

import com.google.gson.Gson;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.dusin.teachassist.util.TheUtil;
import org.dusin.teachassistdbservice.serviceimpl.GeneralService;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

/**
 *
 * @author dusin
 */
@WebServlet(name = "CurrentTeacherClass", urlPatterns = {"/servlet/teacher/CurrentTeacherClass"})
public class CurrentTeacherClass extends HttpServlet {
    private GeneralService instance;

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/json;charset=UTF-8");
        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();
        String semester = request.getParameter("semester");
        if(semester==null){
            semester = TheUtil.thisSemester();
        }
        session.setAttribute("semester", semester);        
        String teacherNo = (String)session.getAttribute("teacherNo");
        
        
        try {
            ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
            instance = (GeneralService) context.getBean("generalService");            
            List<Map<String,Object>> classes = instance.findAllClasses4Teacher(semester, teacherNo);
            
            List<Map<String,Object>> jsonList = new ArrayList<Map<String,Object>>();
            if(classes!=null&&classes.size()>0){
                for(Map<String,Object> c:classes){
                    Integer id = (Integer)c.get("id");
                    String  courseName = (String)c.get("coursename");                    
                    Map<String,Object> map = new HashMap<String,Object>();
                    map.put("id", id);
                    map.put("text", courseName);                    
                    jsonList.add(map);
                    //allClasses.put(id, map);                 }
                    //session.setAttribute("allClasses", allClasses);
                }
            }else{
                Map<String,Object> map = new HashMap<String,Object>();
                map.put("id", -1);
                map.put("text", "没有课程");               
                jsonList.add(map);
            }
            
            Gson gson = new Gson();
            String jsonText = gson.toJson(jsonList);
            out.print(jsonText);
        }catch(Exception e){
            e.printStackTrace();
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
